I have designed and built a flexible and efficient battery charge monitor, in this case for a 12V lead-acid battery, but the same basic design can be used for multiple batteries or lithium cells. The basic circuit consists of a Microchip PIC16F1825, which reads the battery voltage using a...

I've been testing battery power and energy for years now and there iwas one idea that i had in my mind to test multi kilowatt of power... Today i decided to go ahead with that idea !!! TIME FOR KILOWATT POWER TEST !!! What's nice with that cheap idea is that it also include the built-in...

Generally the Peukert effect is considered during discharge of lead-acid batteries, but for charging there is a similar effect. I found a detailed explanation of this phenomenon here: http://www.smartgauge.co.uk/peukert_chg.html and in more detail...

I just finished a discharge test on one of the Li-Ion cells I bought on eBay at the price of $14/4 pieces including shipping. It is rated for 3600 mAh but my test as received showed only 530 mAh. Here's what I did: Now I need to charge it (while using the datalogger), and then another...

I'm sure this question would have been asked before but i can't for the life of me find the thread. i was looking into thundersky batteries mainly because there one of the cheapest lithium going around, and the seem to be good quality. with a long life 3000 cycles (10ish years) with a high max...

Just installed lithiums! Went 65 miles on first trip before the Mini BMS beeped at me, then it let me go another 5 miles without beeping. Charged the pack, but I have one battery I bought off of E-bay that shows fully charged before the other batteries I bought from ElitePowerSolutions.com. So...

I got to take my 2000 Honda Insight to the dealers finally now that I have an 'electrical' problem. But wanted to see if anyone have had this problem. My 144 volt battery will charge but will not discharge, most-likely the controller. Just wanted to hear from a fellow Insight owner.

Hi, I am trying to judge state of charge for a my lifepo(TS90Ah,38 cells, ~120vpack) batteries and looking at the graphs from thundersky I am having issues.... I basically want to know the top voltage (100% charged) and the bottom voltage (70% discharge) range for the 90Ah units. The...